class BooksController < ApplicationController
  # skip_before_filter :authorize
  before_filter :authorize_book, :only => [:create, :update, :destroy, :new, :edit]
  
   protected
  def authorize_book
    if User.find_by_id(session[:user_id])
      user = User.find_by_id(session[:user_id])
      if user.level==1
        redirect_to users_url, :notice => "you can't access this page"
      elsif user.level==3
        redirect_to students_index_url, :notice => "you can't access this page"
      end
    else
      redirect_to login_url
    end
  end
  
  public
  # GET /books
  # GET /books.json
  def index
    @books = Book.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @books }
    end
  end

  # GET /books/1
  # GET /books/1.json
  def show
    @book = Book.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @book }
    end
  end

  # GET /books/new
  # GET /books/new.json
  def new
    @book = Book.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @book }
    end
  end

  # GET /books/1/edit
  def edit
    @book = Book.find(params[:id])
  end

  # POST /books
  # POST /books.json
  def create
    @book = Book.new(params[:book])

    respond_to do |format|
      if @book.save
        format.html { redirect_to @book, notice: 'Book was successfully created.' }
        format.json { render json: @book, status: :created, location: @book }
      else
        format.html { render action: "new" }
        format.json { render json: @book.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /books/1
  # PUT /books/1.json
  def update
    @book = Book.find(params[:id])

    respond_to do |format|
      if @book.update_attributes(params[:book])
        format.html { redirect_to @book, notice: 'Book was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @book.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /books/1
  # DELETE /books/1.json
  def destroy
    @book = Book.find(params[:id])
    @book.destroy

    respond_to do |format|
      format.html { redirect_to books_url }
      format.json { head :no_content }
    end
  end
  
 
  
end
